hw/leon3.c

   1 /*
   2  * QEMU Leon3 System Emulator
   3  *
   4  * Copyright (c) 2010-2011 AdaCore
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "qemu-timer.h"
  26 #include "qemu-char.h"
  27 #include "sysemu.h"
  28 #include "boards.h"
  29 #include "loader.h"
  30 #include "elf.h"
  31 #include "trace.h"
  32
  33 #include "grlib.h"
  34
  35 /* Default system clock.  */
  36 #define CPU_CLK (40 * 1000 * 1000)
  37
  38 #define PROM_FILENAME        "u-boot.bin"
  39
  40 #define MAX_PILS 16
  41
  42 typedef struct ResetData {
  43     CPUState *env;
  44     uint32_t  entry;            /* save kernel entry in case of reset */
  45 } ResetData;
  46
  47 static void main_cpu_reset(void *opaque)
  48 {
  49     ResetData *s   = (ResetData *)opaque;
  50     CPUState  *env = s->env;
  51
  52     cpu_reset(env);
  53
  54     env->halted = 0;
  55     env->pc     = s->entry;
  56     env->npc    = s->entry + 4;
  57 }
  58
  59 void leon3_irq_ack(void *irq_manager, int intno)
  60 {
  61     grlib_irqmp_ack((DeviceState *)irq_manager, intno);
  62 }
  63
  64 static void leon3_set_pil_in(void *opaque, uint32_t pil_in)
  65 {
  66     CPUState *env = (CPUState *)opaque;
  67
  68     assert(env != NULL);
  69
  70     env->pil_in = pil_in;
  71
  72     if (env->pil_in && (env->interrupt_index == 0 ||
  73                         (env->interrupt_index & ~15) == TT_EXTINT)) {
  74         unsigned int i;
  75
  76         for (i = 15; i > 0; i--) {
  77             if (env->pil_in & (1 << i)) {
  78                 int old_interrupt = env->interrupt_index;
  79
  80                 env->interrupt_index = TT_EXTINT | i;
  81                 if (old_interrupt != env->interrupt_index) {
  82                     trace_leon3_set_irq(i);
  83                     cpu_interrupt(env, CPU_INTERRUPT_HARD);
  84                 }
  85                 break;
  86             }
  87         }
  88     } else if (!env->pil_in && (env->interrupt_index & ~15) == TT_EXTINT) {
  89         trace_leon3_reset_irq(env->interrupt_index & 15);
  90         env->interrupt_index = 0;
  91         cpu_reset_interrupt(env, CPU_INTERRUPT_HARD);
  92     }
  93 }
  94
  95 static void leon3_generic_hw_init(ram_addr_t  ram_size,
  96                                   const char *boot_device,
  97                                   const char *kernel_filename,
  98                                   const char *kernel_cmdline,
  99                                   const char *initrd_filename,
 100                                   const char *cpu_model)
 101 {
 102     CPUState   *env;
 103     ram_addr_t  ram_offset, prom_offset;
 104     int         ret;
 105     char       *filename;
 106     qemu_irq   *cpu_irqs = NULL;
 107     int         bios_size;
 108     int         prom_size;
 109     ResetData  *reset_info;
 110
 111     /* Init CPU */
 112     if (!cpu_model) {
 113         cpu_model = "LEON3";
 114     }
 115
 116     env = cpu_init(cpu_model);
 117     if (!env) {
 118         fprintf(stderr, "qemu: Unable to find Sparc CPU definition\n");
 119         exit(1);
 120     }
 121
 122     cpu_sparc_set_id(env, 0);
 123
 124     /* Reset data */
 125     reset_info        = qemu_mallocz(sizeof(ResetData));
 126     reset_info->env   = env;
 127     qemu_register_reset(main_cpu_reset, reset_info);
 128
 129     /* Allocate IRQ manager */
 130     grlib_irqmp_create(0x80000200, env, &cpu_irqs, MAX_PILS, &leon3_set_pil_in);
 131
 132     env->qemu_irq_ack = leon3_irq_manager;
 133
 134     /* Allocate RAM */
 135     if ((uint64_t)ram_size > (1UL << 30)) {
 136         fprintf(stderr,
 137                 "qemu: Too much memory for this machine: %d, maximum 1G\n",
 138                 (unsigned int)(ram_size / (1024 * 1024)));
 139         exit(1);
 140     }
 141
 142     ram_offset = qemu_ram_alloc(NULL, "leon3.ram", ram_size);
 143     cpu_register_physical_memory(0x40000000, ram_size, ram_offset | IO_MEM_RAM);
 144
 145     /* Allocate BIOS */
 146     prom_size = 8 * 1024 * 1024; /* 8Mb */
 147     prom_offset = qemu_ram_alloc(NULL, "Leon3.bios", prom_size);
 148     cpu_register_physical_memory(0x00000000, prom_size,
 149                                  prom_offset | IO_MEM_ROM);
 150
 151     /* Load boot prom */
 152     if (bios_name == NULL) {
 153         bios_name = PROM_FILENAME;
 154     }
 155     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 156
 157     bios_size = get_image_size(filename);
 158
 159     if (bios_size > prom_size) {
 160         fprintf(stderr, "qemu: could not load prom '%s': file too big\n",
 161                 filename);
 162         exit(1);
 163     }
 164
 165     if (bios_size > 0) {
 166         ret = load_image_targphys(filename, 0x00000000, bios_size);
 167         if (ret < 0 || ret > prom_size) {
 168             fprintf(stderr, "qemu: could not load prom '%s'\n", filename);
 169             exit(1);
 170         }
 171     } else if (kernel_filename == NULL) {
 172         fprintf(stderr, "Can't read bios image %s\n", filename);
 173         exit(1);
 174     }
 175
 176     /* Can directly load an application. */
 177     if (kernel_filename != NULL) {
 178         long     kernel_size;
 179         uint64_t entry;
 180
 181         kernel_size = load_elf(kernel_filename, NULL, NULL, &entry, NULL, NULL,
 182                                1 /* big endian */, ELF_MACHINE, 0);
 183         if (kernel_size < 0) {
 184             fprintf(stderr, "qemu: could not load kernel '%s'\n",
 185                     kernel_filename);
 186             exit(1);
 187         }
 188         if (bios_size <= 0) {
 189             /* If there is no bios/monitor, start the application.  */
 190             env->pc = entry;
 191             env->npc = entry + 4;
 192             reset_info->entry = entry;
 193         }
 194     }
 195
 196     /* Allocate timers */
 197     grlib_gptimer_create(0x80000300, 2, CPU_CLK, cpu_irqs, 6);
 198
 199     /* Allocate uart */
 200     if (serial_hds[0]) {
 201         grlib_apbuart_create(0x80000100, serial_hds[0], cpu_irqs[3]);
 202     }
 203 }
 204
 205 QEMUMachine leon3_generic_machine = {
 206     .name     = "leon3_generic",
 207     .desc     = "Leon-3 generic",
 208     .init     = leon3_generic_hw_init,
 209     .use_scsi = 0,
 210 };
 211
 212 static void leon3_machine_init(void)
 213 {
 214     qemu_register_machine(&leon3_generic_machine);
 215 }
 216
 217 machine_init(leon3_machine_init);